Makes a handful of DataSources not replace the existing

chrome/browser/dom_ui/web_ui_favicon_source.cc

Index: chrome/browser/dom_ui/web_ui_favicon_source.cc
diff --git a/chrome/browser/dom_ui/web_ui_favicon_source.cc b/chrome/browser/dom_ui/web_ui_favicon_source.cc
index f2d7128718b5c77bec1f8b1be20cfc2f4641e4ab..2eeafd4b06ee9a715470a02830f87ec091dbf922 100644
--- a/chrome/browser/dom_ui/web_ui_favicon_source.cc
+++ b/chrome/browser/dom_ui/web_ui_favicon_source.cc
@@ -54,6 +54,12 @@ std::string WebUIFavIconSource::GetMimeType(const std::string&) const {
   return "image/png";
 }
 
+bool WebUIFavIconSource::ShouldReplaceExistingSource() const {
+  // Leave the existing DataSource in place, otherwise we'll drop any pending
+  // requests on the floor.
+  return false;
+}
+
 void WebUIFavIconSource::OnFavIconDataAvailable(
     FaviconService::Handle request_handle,
     bool know_favicon,